Recent content by John Mulcahy

With the axis on dBu the figure could be used directly since your test signal is 0 dBu, but note that the SNR definition excludes harmonic distortion so the result would be worse than an SNR figure unless all the harmonics were below the noise floor. You can apply A weighting via the mic cal...

I wouldn't use a method that subtracted anything from the observed energy. REW is a little more conservative than it could be, I agree, and so can include more noise than it might. I'll look at that, but analog systems are often much less well behaved with broader distortion peaks and there...

REW's SNR figure is unweighted, and the N component excludes harmonic distortion. There is an A-weighted N+D figure that is the level of noise + all distortion but that is an absolute figure in the current graph Y axis units, not relative to the signal.

That's on the to-do list to look at for a future version.

If you are attempting to identify the noise floor then I'm afraid that becomes very problematic, since noise floors are rarely flat for real systems and can often include non-harmonic distortion contributions. It is similarly not appropriate to exclude harmonics that appear to lie within or...

That's great, well done. Not sure what you want from me, though.

If the system has a common clock for output and input and the tone is on a bin centre, as seems to be the case here, you could use a rectangular window to reduce the contribution of the noise floor for low level harmonics. In other cases the energy within the spreading span of the window should...

There was an update in V5.40 beta 101 to fix an issue with detecting the 8c on IPV4-only networks.

Those files are ATMOS encodings of the file you load into REW. REW has everything it needs and does not need to be directly connected, the From file measurement option has all the same data as a direct connection.

That file is the original sweep.

Neither is likely to have any effect on your results. The measure with filters feature works as intended. Perhaps you could try connecting a loopback from the output to the input to eliminate any external factors and help isolate where the process is going wrong.

That included file was generated by REW.

On that version it is in Actions, button at the top right.

No, there isn't a way to do that in REW. You can adjust the frequency span you measure, however, or just adjust the graph frequency span :).

This is the response of the filter you generated: There's a lot of time delay in your measurements, which you could fix by adjusting the timing offset. I'm not sure what you intended or expected, but when you generate a minimum phase result the original phase of your measurement is discarded...